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EGR对甲醇HCCI发动机性能和运行范围的影响

, PP. 102-106

Keywords: 汽车工程,内燃机,均质压燃,甲醇,废气再循环,性能,运行范围

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Abstract:

为了解决均质压燃(HCCI)发动机运行范围过窄的问题,在一台HCCI发动机上增加了外部废气再循环(EGR)装置,通过改变EGR率、进气温度及混合气浓度等参数,研究了外部EGR在不同工况下对甲醇HCCI发动机性能和运行范围的影响。结果表明外部EGR可使甲醇HCCI燃烧向更浓的混合气方向拓展,使发动机的最大平均指示压力由无EGR时的0.37MPa增加到0.50MPa,增加了35.14%;平均指示压力的覆盖范围可通过外部EGR得到有效拓宽,在EGR率为12%~15%时达到最大,约有0.22MPa的变动幅度。

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